<template xlang="wxml">
	<view class="tki-tree">
		<view class="tki-tree-mask" :class="{ show: showTree }" @tap="_cancel"></view>
		<view class="tki-tree-cnt" :class="{ show: showTree }">
			<view class="tki-tree-bar">
				<view class="tki-tree-bar-cancel" :style="{ color: cancelColor }" hover-class="hover-c" @tap="_cancel">取消</view>
				<view class="tki-tree-bar-title" :style="{ color: titleColor }">{{ title }}</view>
				<view class="tki-tree-bar-confirm" :style="{ color: confirmColor }" hover-class="hover-c" @tap="_confirm">确定</view>
			</view>
			<view class="tki-tree-view">
				<scroll-view class="tki-tree-view-sc" :scroll-y="true">
					<block v-for="(item, index) in treeList" :key="index">
						<view
							class="tki-tree-item"
							:style="[
								{
									paddingLeft: item.rank * 15 + 'px',
									zIndex: item.rank * -1 + 50
								}
							]"
							:class="{
								border: border === true,
								show: item.show,
								last: item.lastRank,
								showchild: item.showChild,
								open: item.open
							}"
						>
							<view class="tki-tree-label" @tap.stop="_treeItemTap(item, index)">
								<image class="tki-tree-icon" :src="item.lastRank ? lastIcon : item.showChild ? currentIcon : defaultIcon"></image>
								{{ item.name }}
							</view>
							<view class="tki-tree-check" @tap.stop="_treeItemSelect(item, index)" v-if="selectParent ? true : item.lastRank">
								<view class="tki-tree-check-yes" v-if="item.checked" :class="{ radio: !multiple }" :style="{ 'border-color': confirmColor }">
									<view class="tki-tree-check-yes-b" :style="{ 'background-color': confirmColor }"></view>
								</view>
								<view class="tki-tree-check-no" v-else :class="{ radio: !multiple }" :style="{ 'border-color': confirmColor }"></view>
							</view>
						</view>
					</block>
				</scroll-view>
			</view>
		</view>
	</view>
</template>

<script>
export default {
	name: 'tki-tree',
	props: {
		range: {
			type: Array,
			default: function () {
				return [];
			}
		},
		idKey: {
			type: String,
			default: 'id'
		},
		rangeKey: {
			type: String,
			default: 'label'
		},
		title: {
			type: String,
			default: ''
		},
		multiple: {
			// 是否可以多选
			type: Boolean,
			default: false
			// default: true
		},
		selectParent: {
			//是否可以选父级
			type: Boolean,
			default: false
		},
		foldAll: {
			//折叠时关闭所有已经打开的子集，再次打开时需要一级一级打开
			type: Boolean,
			default: false
		},
		confirmColor: {
			// 确定按钮颜色
			type: String,
			default: '#EDAC2F'
		},
		cancelColor: {
			// 取消按钮颜色
			type: String,
			default: '' // #757575
		},
		titleColor: {
			// 标题颜色
			type: String,
			default: '' // #757575
		},
		currentIcon: {
			// 展开时候的ic
			type: String,
			default:
				''
		},
		defaultIcon: {
			// 折叠时候的ic
			type: String,
			default:
				''
		},
		lastIcon: {
			// 没有子集的ic
			type: String,
			default: ''
		},
		border: {
			// 是否有分割线
			type: Boolean,

			default: false
		}
	},
	data() {
		return {
			showTree: false,
			treeList: [],
			selectIndex: -1
		};
	},
	computed: {},
	methods: {
		_show() {
			this.showTree = true;
		},
		_hide() {
			this.showTree = false;
		},
		_cancel() {
			this._hide();
			this.$emit('cancel', '');
		},
		_confirm() {
			// 处理所选数据
			let rt = [],
				obj = {};
			this.treeList.forEach((v, i) => {
				if (this.treeList[i].checked) {
					obj = {};
					obj.parents = this.treeList[i].parents;
					obj = Object.assign(obj, this.treeList[i].source);
					// 移除子元素
					delete obj.children;
					rt.push(obj);
				}
			});
			this._hide();
			this.$emit('confirm', rt);
		},
		//扁平化树结构
		_renderTreeList(list = [], rank = 0, parentId = [], parents = []) {
			list.forEach((item) => {
				this.treeList.push({
					id: item[this.idKey],
					name: item[this.rangeKey],
					source: item,
					parentId, // 父级id数组
					parents, // 父级id数组
					rank, // 层级
					showChild: false, //子级是否显示
					open: false, //是否打开
					show: rank === 0, // 自身是否显示
					hideArr: [],
					orChecked: item.checked ? item.checked : false,
					checked: item.checked ? item.checked : false
				});
				if (Array.isArray(item.children) && item.children.length > 0) {
					// console.log(item)
					let parentid = [...parentId],
						parentArr = [...parents],
						childrenid = [...childrenid];
					delete parentArr.children;
					parentid.push(item[this.idKey]);
					parentArr.push({
						[this.idKey]: item[this.idKey],
						[this.rangeKey]: item[this.rangeKey]
					});
					this._renderTreeList(item.children, rank + 1, parentid, parentArr);
				} else {
					this.treeList[this.treeList.length - 1].lastRank = true;
				}
			});
			// console.log(list)
		},
		// 处理默认选择
		_defaultSelect() {
			this.treeList.forEach((v, i) => {
				if (v.checked) {
					this.treeList.forEach((v2, i2) => {
						if (v.parentId.toString().indexOf(v2.parentId.toString()) >= 0) {
							v2.show = true;
							if (v.parentId.includes(v2.id)) {
								v2.showChild = true;
								v2.open = true;
							}
						}
					});
				}
			});
		},
		// 点击
		_treeItemTap(item, index) {
			if (item.lastRank === true) {
				//点击最后一级时触发事件
				this.treeList[index].checked = !this.treeList[index].checked;
				this._fixMultiple(index);
				return;
			}
			let list = this.treeList;
			let id = item.id;
			item.showChild = !item.showChild;
			item.open = item.showChild ? true : !item.open;
			list.forEach((childItem, i) => {
				if (item.showChild === false) {
					//隐藏所有子级
					if (!childItem.parentId.includes(id)) {
						return;
					}
					if (!this.foldAll) {
						if (childItem.lastRank !== true && !childItem.open) {
							childItem.showChild = false;
						}
						// 为隐藏的内容添加一个标记
						if (childItem.show) {
							childItem.hideArr[item.rank] = id;
						}
					} else {
						if (childItem.lastRank !== true) {
							childItem.showChild = false;
						}
					}
					childItem.show = false;
				} else {
					// 打开子集
					if (childItem.parentId[childItem.parentId.length - 1] === id) {
						childItem.show = true;
					}
					// 打开被隐藏的子集
					if (childItem.parentId.includes(id) && !this.foldAll) {
						// console.log(childItem.hideArr)
						if (childItem.hideArr[item.rank] === id) {
							childItem.show = true;
							if (childItem.open && childItem.showChild) {
								childItem.showChild = true;
							} else {
								childItem.showChild = false;
							}
							childItem.hideArr[item.rank] = null;
						}
						// console.log(childItem.hideArr)
					}
				}
			});
			// console.log(this.treeList)
		},
		_treeItemSelect(item, index) {
			this.treeList[index].checked = !this.treeList[index].checked;
			this._fixMultiple(index);
		},
		// 处理单选多选
		_fixMultiple(index) {
			if (!this.multiple) {
				// 如果是单选
				this.treeList.forEach((v, i) => {
					if (i != index) {
						this.treeList[i].checked = false;
					} else {
						this.treeList[i].checked = true;
					}
				});
			}
		},
		// 重置数据
		_reTreeList() {
			this.treeList.forEach((v, i) => {
				this.treeList[i].checked = v.orChecked;
			});
		},
		_initTree(range = this.range) {
			this.treeList = [];
			this._renderTreeList(range);
			this.$nextTick(() => {
				this._defaultSelect(range);
			});
		}
	},
	watch: {
		range(list) {
			this._initTree(list);
		},
		multiple() {
			if (this.range.length) {
				this._reTreeList();
			}
		},
		selectParent() {
			if (this.range.length) {
				this._reTreeList();
			}
		}
	},
	mounted() {
		this._initTree();
	}
};
</script>

<style scoped>
@import './style.css';
</style>
